Pre-embedded connector formed by hot rolled steel for concrete

ABSTRACT

A pre-embedded connector formed by hot-rolled steel for concrete including a channel bar and an anchor-bolt connecting with it. The channel bar has a channel shape and has a notch. A T type of connecting screw bolt having a bolting portion is provided inside each of the channel feet of the two sides of channel bar. The channel bar is formed by hot-rolling. There are small teeth which are provided on inboard surfaces of the two channel feet of the channel bar, forming two inboard teeth-shape surfaces, which firmly connect with the two inboard surfaces of the bolting portions of the T type of connecting screw bolt. The anchor-bolt is installed on the top of the channel bar and the feet of the anchor bolt are fixed on a planar surface of the top of the channel bar by welding.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a connector for concrete, especially a pre-embedded connector formed by hot-rolled steel for concrete.

2. Description of the Related Art

Currently, a channel pre-embedded connector for concrete is made usually by casting. The top of the groove of the channel connector is provided with a screw bolt and a T type of connecting screw bolt can be provided in the channel feet of two sides thereof. Because the inboard surfaces of both the channel feet and the T type of screw bolts are plane surfaces, the pre-embedded connector is likely to produce a trackslip, leading to a loosening between the T type of screw bolts and the channel feet of the connector, thereby causing problems in the construction of building-decoration. Secondly, the current fasteners further need to be welded in construction, so as to prevent the lateral or vertical displacement. Furthermore, the casts of the channel connector are heavier, and rust easily. This will bring inconvenience to the installing in construction and influence the service-life thereof. Therefore it is necessary to improve the current connectors,

The Chinese patent document No. CN1078290C has opened an anchor-bolting guide for construction engineering and a method for manufacturing it. An opening hole is provided on the molded guide. The cross section of the anchor-bolt is smaller than the opening hole. The anchor-bolt can clip the periphery of the opening hole along the around thereof with the feet, for example, by forging, only in virtue of the material plastic deformation after the anchor-bolt is fixed in the opening hole. The die is pressed on the formed conical portion of the guide from outside when the guide is forged, so as to better form the feet of the anchor-bolt. This type of anchor-bolting guide is manufactured by forge-pressing.

SUMMARY OF THE INVENTION

The object of the present invention is to provide an improved pre-embedded connector formed by hot-rolled steel for concrete, so as to resolve the problems of loosening between the current channel connector casts and the T type of the connecting bolts and the connector casts being heavier, prone to rust, inconvenient in installing of construction and having shorter service-life, and to create such a pre-embedded connector formed by hot-rolled steel for concrete, which has a structure different from the above-mentioned current anchor-bolting guide and is manufactured by a method different from it.

The technical solution of the present invention is as follows:

A pre-embedded connector formed by hot-rolled steel for concrete mainly includes a channel bar and anchor-bolts connected to it. The channel bar has a channel shape and has a notch. A T type of connecting screw bolt having a bolting portion is provided inside the channel feet of the two sides of channel bar. The channel bar is formed by hot-rolling. There are small teeth which are provided on inboard surfaces of the two channel feet of the channel bar, forming two inboard tooth-shape surfaces, which firmly connect with the two inboard surfaces of the bolting portions of the T type of connecting screw bolt. The anchor-bolt is installed on the top of the channel bar and the feet of the anchor bolt are fixed on the planar surface of the top of the channel bar by welding.

The pre-embedded connector for concrete according to the present invention is formed by hot-rolled steel and possesses the following advantages over existing channel connector casts: lighter weight, not prone to rust after zinc-plating, easy to install in construction and a prolonged service-life. Because the anchor-bolt of this connector is fixedly installed on the top plane surface of the groove of the channel bar by welding, it is easy to be installed conveniently, to be welded firmly and can dispense with the annoying procedure of requiring formation of an opening hole on the guide first and then forging the anchor-bolt to be in deformation, so as to clip the periphery of the opening hole, as in the current anchor-building guide. Therefore, this connector presents its application worthiness and wider market perspective.

The pre-embedded connector formed by hot-rolled steel for concrete according to the present invention is designed so that the inboard plane surfaces of the channel feet thereof are teeth-shape surfaces, so as to connect with teeth-shape surfaces of the inside of the T type of bolting portion of the screw bolt tightly and firmly and can reach the function of three-dimensional tightness, no matter whether this pre-embedded connector formed by hot-rolled steel for concrete is designed to be pre-embedded in concrete structure vertically or laterally. It also does not need hereafter to add the unnecessary procedure of welding on the fastener to prevent from the lateral or vertical displacement thereof.

The greatest lateral resistance of earthquake-proofing of the pre-embedded connector in use can reach 57 KN/per each bolt, which is larger than the lateral resistance of the current pre-embedded connector.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a plan view for illustrating the structure of a pre-embedded connector formed by hot-rolled steel for concrete according to the present invention;

FIG. 2 is a cross section view along the line A-A of the FIG. 1;

FIG. 3 is a cross section view along the line B-B of FIG. 1;

The parts used in the application documents, the sign numbers of which are indicated in figures are listed as follows:

-   1 channel bar -   2 anchor-bolt -   3 welding -   4 fusion-weld -   11 notch -   12 top of the channel bar -   13 channel feet     -   14 small teeth -   15 teeth-shape surfaces of the channel feet -   21 feet of the anchor-bolt -   22 strengthening rib -   23 strengthening rib

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Referring to FIGS. 1 and 2, the pre-embedded connector formed by hot-rolled steel for concrete according to the present invention comprises mainly a channel bar 1 and an anchor-bolt 2 connecting with it. The channel bar 1 presents a channel shape and has a notch 11. Inside the notch 11 of two channel feet 13 of the channel bar 1 a T type of connecting screw bolt is provided (not shown in Figs) and the T type of screw bolt is provided with a bolting portion for tight pressing the channel feet 13 of two sides thereof.

The small teeth 14 are provided on the inboard surfaces of the both two channel feet 13 of the channel bar 1 to form two inboard teeth-shape surfaces 15. The two inboard teeth-shape surfaces 15 of the channel feet tightly connect with the two inboard surfaces of the bolting portion of the T type connecting screw bolt, so as to tightly mesh and firmly connect the both inboard surfaces. The small teeth 14 provided on the teeth-shape surfaces 15 of the two channel feet can be thin teeth, which are arranged continuously, i.e., (not interrupted) or they can be serrations, which are arranged intermittently, i.e. in intervals.

The teeth-shape surfaces 15 of the channel feet firmly mesh-connect with the bolting portion of the T type of connecting screw bolt, both of the two inboard surfaces of which can be provided as plane surfaces, or provided with small teeth to form two inboard teeth-shape surfaces, enabling them to more firmly connect with two teeth-shape surfaces 15 of the two channel feet.

The anchor-bolt 2 is installed on a top 12 of the channel bar 1 and the feet 21 of the anchor-bolt are fixed on a planar surface of the top 12 by welding. With reference to FIG. 2, the feet 21 of the anchor-bolt 2 are fixedly connected to the planar surface of the top 12 by welding 3. Further referring to FIG. 2, the feet 21 of the anchor-bolt are firmly connected to the planar surface of the top 12 by fusion-welding 4. The fusion-welding 4 produces an electric arc by a soldering gun of a soldering machine, enabling the feet 21 of the anchor-bolt to fusion-connect to the plane of the top 12.

The channel bar 1 of the pre-embedded connector is formed by hot-rolling, i.e., hot-rolling steel, so as to be more easily machine-shaped.

The fasteners cannot be loosened after the pre-embedded connector and the T type of connecting screw bolt are tightened together with each other when suffering the shock or shake from any axis, thereby enabling improvement in security and reliability.

It will be appreciated by those skilled in the art that the above-mentioned embodiment is only used for describing the present invention and not is the definition to the present invention and various changes or variations of the above embodiment may be made without departing from the scope of the invention and will fall into within the scope defined by the claims of this application. 

1. A pre-embedded connector formed by hot-rolled steel for concrete, comprising: a channel bar; an anchor bolt connected to the channel bar, the channel bar having a channel shape and having a notch; and two T-type connecting screwbolts provided inside two channel feet formed on two sides of the channel bar, respectively, each of the T-type connecting screwbolts having a bolting portion, wherein the channel bar is formed by hot-rolling, wherein small teeth are provided on inboard surfaces of the two channel feet of the channel bar so as to form two inboard teeth-shape surfaces for firmly connecting with the inboard surface of the bolting portion of each of the two T-type connecting screwbolts, and wherein the anchor bolt is installed on a planar surface of a top of the channel bar and the feet of the anchor bolt are fixed on a planar surface of the top of the channel bar by welding.
 2. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 1, wherein said peripheral surfaces of the anchor-bolt are provided with projecting strengthening ribs.
 3. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 2, wherein the projecting strengthening ribs are arranged spirally.
 4. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 2, wherein the projecting strengthening ribs are arranged in a patterned form.
 5. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 2, wherein the projecting strengthening ribs are arranged longitudinally.
 6. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 1, wherein the small teeth, which are provided on the teeth-shape surfaces of the channel feet of the channel bar, are thin serrations 14 which are arranged continuously.
 7. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 1, wherein the small teeth, which are provided on the teeth-shape surfaces of the channel feet of the channel bar, are thin serrations 14 which are arranged intermittently.
 8. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 1, wherein the feet of the anchor-bolt are fixedly connected to the plane surface of the groove top by welding.
 9. The pre-embedded connector formed by hot-rolled steel for concrete according to claim 1, wherein the feet of the anchor-bolt are fixedly connected to the plane surface of the groove top by fusion-welding. 